B2 5.5.1 note (#644)

* B2 5.5.1 note
* Update boost_1_92_0.adoc

Author: grafikrobot

release-notes/boost_1_92_0.adoc

@@ -176,6 +176,11 @@ handling of rewritten relational operators (boost_gh:pr[icl,54]).
 ** Fixed a performance issue with closed-addressing containers when rehashing at very large
    container sizes (boost_gh:pr[unordered,348]). Contributed by Daniel Král.
 
+== Updated Tools
+
+* boost_phrase:library[B2,/tools/build/]:
+** Includes release of https://www.boost.org/tools/build/doc/html/#_version_5_5_1[B2 version 5.5.1].
+
 == Compilers Tested
 
 // Edit this section as appropriate